Elevator-door-operating device.



1.`B. DAVIS,` ELEVATOR DOOR OPERATING DEVICE.

APPLICATION FILED MAY 20. 1916.

Patented Nov. 6, 1917.

2 SHEETSSHEET I.

N lNvEN'ron WITN ESSES JOHN'B. DAVVIS, OF CLEVELAND, OHO, ASSIGNOR T0 THE W'. S. TYLER COVMIANY, 0F y CLEVELAND, OHIO, .A CORPORATION OF OHIO.

nLnvATon-noonornnarInG DEVICE.

Application Ied May 20, 1916. Serial No; 98,825.

To f/.ZZ whomy t 'may concern.'

Be it known that l, JoI-INB. Davis, a citizen of the United States, and a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful improvement in Elevator-Door-Operating Devices; and I do hereby declare the following to be afull, clear, and exact description thereof lilly invention pertains to elevator-dooroperating devices, and relates especially to operating devices for elevator-doers of the4 type in which two doors are employed'to close the opening, the doors, when in their open position, nesting one behind the other. lt is the principal object of my invention to provide a simple,`strong and eiiicient operating device for causing one of said doors to move yat twice the speed ofthe other door,`

whereby, by actuating one or the other ofthe doors, both of them can be moved from their nested open position into a closed position in whichone door` forms an extension f the other. It is another object of my invention to provide a door-operating mechanism of this character whichV will take up but little space, and which can be locatedr above the doors. lt is another object of my invention to provide a. mechanism of this character which will permit the doors to slide easily, and enable theml to be operated with a minimum of effort. Other ob jects of my invention will appear fromthe following specification taken in connection 7ith the annexed claims. f

By way of example, l have shown in the accompanying drawings, and described lin the following specilication, one form' of door-operating device constructed in accordance with my invention. It is to be understood, however, that the invention may be embodied in other forms, and that changes may be made in the form described andy shown, without exceedin the scope thereof as defined in the appen ed claims.

In the drawings:

Figure l is a. plan of an elevator door opening provided with sliding doors and a door operating mechanism constructed in accordance with my invention;

Fig. 2 is an elevation of the same, viewed from the rear, showing the doors in their open position;

Fig. 3 is a view similar to Fig. 2, but showing the doors in their closed position;

Specification of Letters latent.l

Patentedllov. 6, i917.

F ig.: 4L is an enlarged section, the section being taken on the line 4.-4 of Fig. 3, looking in the direction of the arrows;` and Fig. 5 is an enlarged detail section taken on the line 5-5 of Fig. 3, looking in the direction of the arrows.

Like reference characters refer to like ing drawings.

Extending lengthwise of the door-way, at`

the front of the same and above the doors, are a pair of parallel tracks l0, 10a having il-shapedv grooves 11 therein. Running in the grooves 1l, are bearing members, each of which includes a spacing bar 12 ha ring a plurality of holes formed therein for the reception of. balls 13, the latter being held in place by means of lugs 1i on they spacing bar. The balls 13 also engage in V-shaped grooves 15 of track members 16 and 1ba respectively. .Y

' Thetrack members 16 and 1ba are connected, by means of elongated brackets 17, with doors 18 and 18a, of which the door 18 will hereinafter' be referred toV as the slow door, and the door 18a will be hereinafter referred to as the fast door. ln theirV open position, the doors-18 and 1SFL are disposed behind each other, as shown in Fig., 3. In the closed position of the doors, the fast door 18 4forms an extension of the slow door 1S, the two doors closing the. opening, as shown inFigfQ. llt will'be seen that, when;v the doors are moved from the position shown in Fig. 2 to the position shown in Fig. 3, the' door 18nis moved twice the distance, and atl twice the speed, of the i door 18.

The tracks and track members are covered by a casing which includes a front plate 19, a rearV plate 20, and a top plateQl, such cas# ing being constructed so as to provide a space at the rear sufficient to inelose the oplbolt 26, or the like.y The chain islikewise connected, close to the pulley adjacent the closed side of the door-way, with the bracket 17 of the fast door 1S, the connection being made by means of a bracket 27 carrying suitable means for adjusting the tension of the chain or band.

In the movement of the pulley frame from right to leit, any point on the lower part of the band or chain 25 moves at twice the speed at which the pulley frame moves. Consequently, if the slow door 18, which is connected to the pulley frame, is manually moved from its position in Fig. 2 to its posie tion in Fig. 3, the. fast door 18a, being connected to the chain or band, will be moved thereby from the position shown in Fig. 2 to the position shown in Fig. e., twice the distance of the slow door. The door may equally well be operated, oi course, by actuating the fast door, which will result in the slow door being moved half the distance.

he device described above provides a very simple and eiiicient means for operating an elevator door of the type in which one door must m ve a farther distance than the.

other in opening and closing. The doors move very easily, and can be operated with very little effort, moreover, there are no parts which are at all liable to get out of order. The construction is such that all of the devices may be mounted in a comparatively small space immediatelv above the door.

Having thus fully described my invention, what l claim as new and desire to secure by Letters Patent, is

1. ln door operating device, in combination, a stationary front track and a stationary rear track, said tracks being disposed parallel with each other and spaced apart, ball carriages coperating with said tracks, a movable front track coperating with the ball carriage of said stationary front track, a movable rear track cooperating with the ball carriage ci" said stationary rear track,

a door hanger connected with said movable front track and extending downward between said stationary tracks, a second door hanger connected with said movable rear track and extending downward at the rear ot' said stationary rear track, a frame eX- tending longitudinally or" said tracks, a connecting bar between said movable front track and said frame, said bar extending over sai d movable rear track, pulleys carried at the ends of said frame, an end-less band passing around said pulleys, means for connecting said band, below said pulleys, te the hanger ci' said movable rear track, and means for securing a portion of said band against movement.

2. ln a door operating device, in combination, a stationary front track and astationary rear track, said tracks being disposed parallel with each other and spaced apart, and having longitudinal v'Lshaped slots therein, a movable front track and a movable rear track each having "if -shaped slots therein, said movable tracks being disposed above said stationary tracks, ball carriages disposed between said tracks and coperating therewith, a door hanger connected with said movable liront track, a pulley 'frame including longitudinal side members, a bracket secured to said movable front track and extending over Genies er this patent may be obtaine fer ve cents each, by addressing thev Sommssoner of Eatena,

' Y Waahingtam t5. 

